Look for some of those double sided sticky things, kinda like on the back of those little dial thermometers. I forgot for the life of me what they're called.

It's kinda like Poster tack only a little stronger

(something like this http://www.amazon.com/Command-Adhesi...629386&sr=1-22 )

Hope that helps

Or heck, go buy some of those heat/humidity dials, and just pull that sticky stuff off and use it!